(E)-Cefpodoxime Proxetil-d3 is the isotope labelled analog of (E)-Cefpodoxime Proxetil (C243855); the (E)-isomer of Cefpodoxime Proxetil (C243860) which is an antibacterial and broad spectrum, orally absorbed third generation cephalosporin. The (E)-isomer tends to have less antibacterial activity than the (Z)-isomer.